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here is a Philips SQ E88CC Heerlen Holland 1963 matched pair from my tube collection.used for maybe 2-3000 hours, bought NOS 8 years ago. Time to try these very sough after tubes for a fraction of NOS price.I don't have a tube tester, but they are playing strong in my Copland CTA 305 preamp. no microphonics.demos are welcome. shipping at buyer's expense, paypal add 3%.